Congratulations on your progress so far! I'm in Fundamentals 1 as well and just watched the final videos on that level. Lisa states that she doesn't expect you to be able to do everything with full mastery by the end of the course- but to understand it and be working on it in your practice.

It sounds to me like you are ready to move forward. Plus you can always return to the previous lessons if you need a reminder or want to practice there.